Expansion device of rugged tablet



FIG. 1 is a top front right perspective view showing my new design;

FIG. 2 is a top rear left perspective view of my new design;

FIG. 3 is a front view of my new design;

FIG. 4 is a rear view of my new design;

FIG. 5 is a left side view of my new design;

FIG. 6 is a right side view of my new design;

FIG. 7 is a top view of my new design; and,

FIG. 8 is a bottom view of my new design. 

CLAIM The ornamental design for an expansion device of rugged tablet, as shown and described. 